coolent temp sensor 07 tb 4.2 - Page 2 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



Welcome Enthusiast! If you already own a Chevy TrailBlazer or GMC Envoy or perhaps thinking of purchasing such a vehicle, then you have come to the best TrailBlazer and Envoy site on the net! Rainier, Bravada, Ascender, and 9-7x owners welcome too!

You are currently viewing our site as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to search and post topics, communicate privately with other members, respond to polls, upload content, and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.
Join Today!
Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

TrailVoy.com is the premier GMC Envoy Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools
  #11  
Old 09-23-2012, 02:52 PM
54inches's Avatar
54inches 54inches is offline
Member
 
2007 Chevy TrailBlazer LS
Imperial Blue Metallic 4.2L I6 2WD
Join Date: Aug 2007
Location: Houston
Posts: 130
Quote:
Originally Posted by TrailblazrI6 View Post
Not sure where you got those first diagrams but that is not our engine. I found it on the web too at a very generic website and there is NO reference to that going to the 4.2l I6 Atlas engine. The coolant temperature sensor location never changed on the 4.2l engine.

However, your last picture shows the temperature sensor, right above the t-stat, behind the alternator. I can clearly see it. Good luck.
Quote:
Originally Posted by TrailblazrI6 View Post
Its ABOVE that metal round piece. I can see the wire going to it

After this, I would give up working on cars. I dont think its your thing....
I love it when people come on forums with your attitude and I have pictures to prove you are wrong.

RHS is correct, GM changed it to the opposite side of the engine and I have pictures to prove it.

I just change my thermostat and was going to change the temp sensor, but it is too hard to get to and there is beer to drink and football to watch today.

I think after this, you should stfu and stay off forums.

Pictures to come soon.
__________________
05V LS7 Clutch,Headers,xpipe/bullets,DV8S Shifter, SFCs & 8.8 swap; DSS 1400hp axles, 389hp 378tq
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #12  
Old 09-23-2012, 04:08 PM
rhswarrior04 rhswarrior04 is offline
Junior Member
 
2007 Chevy TrailBlazer LT
Red Jewel Tintcoat 4.2L I6 4X4
Join Date: Dec 2011
Location: Charleston, WV
Posts: 6
thanks 54 yea it is where i thought it was and where you say it is the last diagram i posted shows it i also posted a pic in the post of where he thought it was just to show him that it was different i guess some people cant understand that gm or any automaker for that matter changes their designs from time to time i ended up taking it to my local shop because i didnt have the proper tool and didnt want to modify one of my sockets plus it was well worth the $40 bucks the shop charged just to not have to take the time to change it myself and just a heads up if you want to do it yourself at least on mine its a 15mm wrench or if you can find or want to modify a 15mm socket to look like a o2 sensor socket is the easiest way thats what the shop i took it to ended up having to do cause they couldnt get a wrench to it good luck with it
Reply With Quote Quick reply to this message
  #13  
Old 01-04-2013, 09:41 PM
54inches's Avatar
54inches 54inches is offline
Member
 
2007 Chevy TrailBlazer LS
Imperial Blue Metallic 4.2L I6 2WD
Join Date: Aug 2007
Location: Houston
Posts: 130
No worries brother!

Glad it worked out for you.

Cheers,
__________________
05V LS7 Clutch,Headers,xpipe/bullets,DV8S Shifter, SFCs & 8.8 swap; DSS 1400hp axles, 389hp 378tq
Reply With Quote Quick reply to this message
  #14  
Old 01-06-2013, 08:45 AM
smoore1903 smoore1903 is offline
Junior Member
 
2006 Chevy TrailBlazer LT
Summit White 4.2L I6 4X4
Join Date: Nov 2006
Location: Cleveland, OH
Posts: 1
I've been a long time viewer here, but first time poster. This site has saved me countless times already.

I would agree with RHS above, I changed out my thermostat yesterday and was going to change out the ETC sensor at the same time, but did not find it above the thermostat as expected (2006 model year). So, yes, it does appear the location was moved starting in 2006. I think I did find it on the opposite side, left rear corner of the block. Looks very hard to get to, pretty darn close to the firewall and possibly behind the manifold heat shield. I gave up and hope the thermostat solves my P0128 code. 54 inch, if you still have those pics, that would be awesome to see.
Reply With Quote Quick reply to this message
  #15  
Old 01-19-2013, 09:05 PM
richielj richielj is offline
Junior Member
 
2006 Chevy TrailBlazer LS
Silverstone Metallic 4.2L I6 2WD
Join Date: Jan 2013
Location: TX
Posts: 1
Quote:
Originally Posted by rhswarrior04 View Post
this is a diagram i found that shows it where i thought it was and a pic to compare that mine is not the same as this one so they obviously did change the sensor location sometime between an 02 and the 07 my question is whats the easiest way to get to it any help would be greatly appreaciated
Thanks for this picture. I found on the 2006 Trailblazer we have it is moved also. Sorry for the expert that didn't help you much because I found the same thing your picture showed the machined area where it was originally and couldn't find the new location. The new location I can't tell what all to take off to replace it so hopefully a new thermostat will cure the engine code issue. I can't see/trace the exact location of the sensor but found the wire plug in and then it goes down out of sight.

Will deal with it if the thermostat doesn't cure the code.
Reply With Quote Quick reply to this message
  #16  
Old 09-18-2015, 09:40 PM
psuturtle psuturtle is offline
Junior Member
 
2006 Chevy TrailBlazer LT
Bordeaux Red Metallic 4.2L I6 4X4
Join Date: Jan 2007
Location: NC
Posts: 10
Sorry to dig up an old thread, but yeah +1 to the OP on the fact that the sensor location DID change. I've seen pics of the block where the sensor is right above the thermostat, and it is most definitely NOT there on my engine. Most threads about thermostats on here assume it's in the original location, but that's certainly not the case with all trailvoys.

I've got the thermostat replaced and everything seems OK so far. However, does anybody have any pics/advice on how to change the sensor if my coolant temps don't normalize? I ordered the sensor with the rest of the parts, so I'm going to hold on to it for now. Just curious if there are any tips on how to change it out when it's on the passenger side. Also, I'm hoping I don't have to drain coolant (again) if I decide to go change out this sensor.
Reply With Quote Quick reply to this message
  #17  
Old 11-24-2015, 07:59 AM
Roamingdoc Roamingdoc is offline
Junior Member
 
2002 Chevy TrailBlazer LTZ
Summit White 4.2L I6 4X4
Join Date: Jul 2007
Location: Prescott, AZ
Posts: 95
Question One Last Question... Replace it or not?

So I have the AC Delco Thermostat about to replace the orginal (232K on this funny TBlzr). I've been getting P0128 and the gauge shows a lower temp than it should be / was once.

So taking off the alternator (and battery in my case as I'm adding a three wire to it) and seeing the thermostat there, I was "thinking" (yeah, right), "maybe I should just replace the sensor too??"

So, what is, or is there one, the consensus on knowing 'which' (or is it both) item causes the P0128?

Always appreciate this forum, the good responses. We have a long lived Trailblazer and a lot of that is the good advice here! Thanks!
Reply With Quote Quick reply to this message
  #18  
Old 04-26-2016, 05:27 PM
AzTruckGuy AzTruckGuy is offline
Junior Member
 
2003 Chevy TrailBlazer SS (LS)
Polo Green Metallic 4.2L I6 4X4
Join Date: Nov 2015
Location: Yuma, Az
Posts: 33
Now I'm digging up this old thread, changing out the T-Stat myself and Sensor myself, Thanks for this thread its helping see where mine is. Wow the know it all jerk on this post is what this board doesn't need
Reply With Quote Quick reply to this message
  #19  
Old 04-26-2016, 09:45 PM
robertgee robertgee is offline
Senior Member
 
2006 Chevy TrailBlazer LS
Sandstone Metallic 4.2L I6 4X4
Join Date: Oct 2007
Location: Hendersonville, N.C.
Posts: 672
"Wow the know it all jerk on this post is what this board doesn't need "

My late father would sum it up this way ...... "there's more horses asses than horses".
Reply With Quote Quick reply to this message
  #20  
Old 06-29-2016, 10:49 PM
sw904 sw904 is offline
Junior Member
 
2006 Chevy TrailBlazer LT
Summit White 4.2L I6 4X4
Join Date: Oct 2011
Location: US
Posts: 2
2006 and later Trailbazer temperature coolant sensor location

It appears that even though the 2006 and later Trailblazers still use the 192 degree thermostat and the same coolant temperature sending unit, the dash gauge now reads 212 degrees. Unfortunately, this corresponds to GM's moving the coolant temperature sending unit from the thermostat location to the extreme opposite side of the engine right above the #6 exhaust. This changes the level of difficulty from a real joy to pita.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum forums, you must first register.

Please enter your desired user name, your email address and other required details in the form below.
(Only letters, numbers, dashes and underscores are permitted for user names)
The user name that you choose is permanent and can never be changed.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Location
Where you live (ex: Philadephia, PA)
Vehicle Year
Choose your year
Or enter your choice here:
Vehicle Color
Choose your factory color (Custom, Not Listed & Two-Tones; Use Text Field Below)
Or enter your choice here:
Vehicle Make
Choose your make
Or enter your choice here:
Vehicle Model
Choose your model
Or enter your choice here:
Vehicle Engine
Choose your engine
Vehicle Drivetrain
Choose your vehicle drivetrain
Security Question
Fill in the blanks: Tra___oy
Insurance
Please select your insurance company (Optional)

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


» Sponsors

Advertising Info

All times are GMT -4. The time now is 06:39 AM.


Chevy TrailBlazer and GMC Envoy Enthusiasts - Copyright 2004 - 2009 All Rights Reserved.
All trademarks referenced herein are property of their respective owners.
RSS Feed